|
|
| Hydrogen fluoride |
HF |
NO.17D |
| Performance |
Measuring
Range
|
1 to 100 ppm |
Sampling Hours
|
1 to 10 hours |
Detecting Limit
|
0.05 ppm (10 hours) |
Color Change
|
Yellow --->
Purple |
| Reaction
Principle |
Hydrogen fluoride
reacts with indicator to produce purple color. |
| Coefficient
of Variation |
15% (for 10 to
20 ppm-hr),10% (for 20 to 100 ppm-hr) |
| Shelf
Life |
3 Years |
| Corrections
for temperature & humidity |
Temperature and
Humidity correction is necessary |
| Store the
tubes at cool and dark place. |
| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Chlorine
|
1/5 time
|
Plus error
(Bleaches zero zone)
|
Bleaches zero zone |
Hydrogen chloride
Nitric acid
|
1/5 time |
Plus error
|
Discolors Purple |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| - |
C 3 ppm |
- |
|
